To be the devil's advocate, or the imp's advocate at least, there aren't a lot of schools that offer "Harming People" as a Bachelor degree. If you want to learn how to effectively harm someone, psychology or health sciences are the most logical routes to take: They teach exactly what harms people, because they need to teach that in order to clarify what helps people.

Your logic, as I can infer it, is street drug manufacturers would never take any chemistry courses or education, because street drug makers use chemical knowledge to harm people, and chemistry courses teach how to NOT do that, so clearly, it would be of no help to them.

Not saying he's right, just that your thought process is odd at best here.